ABSTRACT

Person Field is in Karnes County, Texas. It is one of a series of fields located along a northeast trending regional fault system in which oil and gas condensate are produced from Lower Cretaceous, Edwards, carbonate reservoirs.

The field was discovered by Brazos Oil and Gas Company in 1959. Hydrocarbons are trapped on the upthrown sides of three slightly arcuate up-to-the coast normal faults which intersect the southeast dipping Edwards strata. The reservoir is divided into the "Upper Edwards" which averages 175 feet in thickness and contains two porous limestone zones and three porous dolomite zones, and the "Lower Edwards," about 375 feet thick and predominantly limestone.

The oil column is about 120 feet, and the gas column is approximately 350 feet. Total cumulative production as of March 1, 1962, was 1,553,000 barrels of oil. Objective sections above the Edwards are water bearing, while in three deep tests (to the Sligo) porous sections were of too low permeability to be commercial. The field limits are essentially defined, at a length of about 7 1/2 miles and a width slightly over a mile.

Shell Oil Company is currently completing a 15 million cubic foot capacity gas treating plant at Person for the extraction of sulphur and sale of sulphur and sweetened gas. The plant will be owned by all the operators in the field.